SmokeCloud = {}
class('SmokeCloud').extends(playdate.graphics.sprite)

function SmokeCloud:init(x, y)
    SmokeCloud.super.init(self)

    self.radius = 25
    self.maxLife = 150
    self.life = self.maxLife

    local size = self.radius * 2 + 4
    self:setSize(size, size)
    self:setCenter(0.5, 0.5)
    self:setZIndex(ZIndex.fx - 1)
    self:moveTo(x, y)
    self:add()
    self:markDirty()
end

function SmokeCloud:update()
    if not BomberScene.instance then
        self:remove()
        return
    end

    self:moveBy(0, BomberScene.instance.scrollSpeed)
    self.life = self.life - 1

    if self.life <= 0 or self.y > 280 then
        self:remove()
        return
    end

    self:markDirty()
end

function SmokeCloud:draw()
    local t = self.life / self.maxLife
    local r = self.radius * t
    local cx = self.width / 2
    local cy = self.height / 2

    local dither = playdate.graphics.image.kDitherTypeBayer4x4
    if t < 0.3 then
        dither = playdate.graphics.image.kDitherTypeBayer8x8
    elseif t < 0.6 then
        dither = playdate.graphics.image.kDitherTypeBayer4x4
    end

    playdate.graphics.setColor(playdate.graphics.kColorBlack)
    playdate.graphics.setDitherPattern(1 - t * 0.6, dither)
    playdate.graphics.fillCircleAtPoint(cx, cy, r)
    playdate.graphics.setColor(playdate.graphics.kColorBlack)
end